Organic carbon content decreases with increasing grain-size. Maximum 

 values of 2.1% organic content were found by Folger (1972 a) in the estuarine 

 clays, while values of 0.5% were found in sand-sized sediments. 



Ross (1967) has delineated the areal distribution of sediments delivered 

 to the shallow inshore by the Penobscot River on the basis of the presence 

 and abundance of amphiboles in the sand fraction of the sediments. Sediment 

 is dispersed in a fan-like pattern from the mouth of the river. The dispersed 

 fan extends as far south as Isle au Haut and as far east as Mount Desert Island. 

 Although this dispersal pattern contradicts a southwest drift flow along the 

 Maine coast, no reason for the anomolous distribution has been offered. 



Hydrology: 



The Penobscot River drains 17,280 km^ with an average discharge of 

 335 cu m/sec and extremes exceeding 4330 cu m/sec. Peak discharge occurs 

 in late April or early May. On the average, the Penobscot delivers 242 tons 

 of suspended sediment daily to Penobscot Bay in concentrations of approximately 

 11 mg/1 (U.S.G.S. 1978). 



Bedrock wells in the region yield an average 9 gpm (Prescott 1966) . 

 Zones of high bedrock groundwater yield occur in Bucksport, Deer Isle, Belfast, 

 Camden, Bangor and Brewer along the Penobscot River. Other areas have low 

 yields, especially east of Penobscot Bay where granitic rocks are common. 

 Bedrock wells in Verona yield high iron content water. 



Surface wells are common in Region 4 as rural areas dominate. High 

 yields can be expected in the ice-contact eskers in Waldo, Penobscot and 

 Hancock Counties, while lower yields are to be expected in most other areas. 



Region 5 (Blue Hill Bay to Addison) 



Bedrock Geology: 



Large granite plutons dominate the geology of Hancock County. The two 

 most prominent topographic features of the region, Mt. Desert and Tunk Mtn. 

 are ring-dike complexes of central granite rocks surrounded by other intrusives. 

 Metamorphozed volcanics occur in the lowlands, but the entire region is under- 

 lain mostly by plutonic rocks. 



Schists, slates and metasandstones of Cambro-Ordovician Age occupy land 

 areas in between ring-dike complexes, and these rocks are metamorphozed more 

 strongly locally adjacent to the igneous complexes. 



Region 5 is less seismically active than the remainder of the coast — only 

 two seismic events have originated within the region since 1766, both events 

 «7ere below magnitude II (Bloxsom 1975). Only two major faults have been 

 napped in the Region (Hussey 1972) . These faults have cut through Cambro- 

 Drdovician slates in a northeasterly direction just above Ellsworth. 



(Continued) 

 2-D-7 



10-80 



